在Swift 3.0中JSON解析失败

Question

我想将JSON数据转换为Swift 3.0格式，但是出现错误。

这里是我的JSON数据：

"items": [ 
    { 
    "kind": "youtube#searchResult", 
    "etag": "\"m2yskBQFythfE4irbTIeOgYYfBU/fJgYDRLJbQIA4cQD71Hu-VtHYuM\"", 
    "id": { 
    "kind": "youtube#video", 
    "videoId": "diVd_vpuons" 
    }, 
    "snippet": { 
    "publishedAt": "2015-07-16T13:47:55.000Z", 
    "channelId": "UC1iwdTRSV1Z2DMopttg8ocA", 
    "title": "Bengali Pala Kirtan | New Bhajan Kirtan | 2015 | Sabitri Satyaban | Shanta Das | Gold Disc", 
    "description": "Watch The New Bengali Pala Kirtan By Shanta Das \"Sabitri Satyaban \". Song : Sabitri Satyaban Album : Sabitri Satyaban Singer : Shanta Das Music By ...", 
    "thumbnails": { 
    "default": { 
     "url": "", 
     "width": 120, 
     "height": 90 
    }, 
    "medium": { 
     "url": "", 
     "width": 320, 
     "height": 180 
    }, 
    "high": { 
     "url": "", 
     "width": 480, 
     "height": 360 
    } 
    }, 
    "channelTitle": "RDC Banglar Geeti", 
    "liveBroadcastContent": "none" 
    } 
}, 

这是我的银行代码：

func getChannelDetails(_ useChannelIDParam: Bool) { 
    var urlString: String! 
    if !useChannelIDParam { 
     urlString = "https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&maxResults=50&playlistId=PLbhFoUkf_GY6us_3RYg7U_NeNbqlc2AXY&key=AIzaSyAop5T2uSqj4Mw9nAE740za7mAHHiRwO2M" 
    } 

    let targetURL = URL(string: urlString) 

    performGetRequest(targetURL, completion: { (data, HTTPStatusCode, error) -> Void in 
     if HTTPStatusCode == 200 && error == nil { 

      do { 
       // Convert the JSON data to a dictionary. 
       let resultsDict = try JSONSerialization.jsonObject(with: data!, options: []) as! Dictionary<String, Any> 

       // Get all playlist items ("items" array). 
       let items: Array<Dictionary<String, Any>> = resultsDict["items"] as! Array<Dictionary<String, Any>> 

       // Use a loop to go through all video items. 
       for i in 0 ..< items.count { 

        var desiredValuesDict: Dictionary<String, Any> = Dictionary<String, Any>() 

        let objDicit = (items[i] as Dictionary<String, Any>)["id"] as! Dictionary<String, Any> 

        desiredValuesDict["videoID"] = (objDicit["videoID"] as! Dictionary<String, Any>) ["videoId"] 


        let snippetDict = (items[i] as Dictionary<String, Any>)["snippet"] as! Dictionary<String, Any> 

        // Get the snippet dictionary that contains the desired data. 

        // Create a new dictionary to store only the values we care about. 

        desiredValuesDict["title"] = snippetDict["title"] 

        desiredValuesDict["thumbnail"] = ((snippetDict["thumbnails"] as! Dictionary<String, Any>)["high"] as! Dictionary<String, Any>)["url"] 


        //desiredValuesDict["videoID"] = (snippetDict["resourceId"] as! Dictionary<String, Any>) ["videoId"] 


        // Save the channel's uploaded videos playlist ID. 

        // Append the desiredValuesDict dictionary to the following array. 
        self.channelsDataArray.append(desiredValuesDict) 

        // Reload the tableview. 
        self.tblVideos.reloadData() 

        // Load the next channel data (if exist). 
       } 
      } catch { 
       print(error) 
      } 

     } else { 
      print("HTTP Status Code = \(HTTPStatusCode)") 
      print("Error while loading channel details: \(String(describing: error))") 
     } 
     self.viewWait.isHidden = true 
    }) 
} 

标题和图像显示的，但我收到以下错误：

thread signal sigabrt xcode

Answer 1

这将有助于清除源代码

let urlString = "The URL" 
    let targetURL = URL(string: urlString) 
    performGetRequest(targetURL, completion: { (data, HTTPStatusCode, error) -> in 
     if let error = error { 
      //do something with the error 
     } 
     else { 
      do { 
       if let resultsDict = try JSONSerialization.jsonObject(with: data!, options: []) as? [String:Any] { 
        if let items = resultDict["items"] as? [[String:Any]] { 

         //var parsedItems = [[String:Any]]() 

         for item in items { 

          var desiredValues = [String:Any]() 

          //get the videoId 
          if let id = item["id"] as? [String:Any], let videoId = id["videoId"] as? String { 
           desiredValues["videoId"] = videoId 
          } 

          //get title and thumbnail from snippet 
          if let snippet = item["snippet"] as? [String:Any] { 
           if let title = snippet["title"] { 
            desiredValues["title"] = title 
           } 

           if let thumbanail = snippet["thumbnails"] as? [String:Any], let highValues = thumbanail["high"] as? [String:Any], let url = highValues["url"] as? String { 
            desiredValues["url"] = url 
           } 
          } 

          self.channelsDataArray.append(desiredValues) 

         } 

         DispatchQueue.main.async { 
          self.tblVideos.reloadData() 
         } 
        } 
       } 
      } 
      catch (let error){ 
       print("Error while parsing data: \(error.localizedDescription)") 
      } 
     } 
    } 

而且如果你把所有的值channelsDataArray然后访问它像

override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    if let playerViewController = segue.destination as? PlayerViewController { 
     playerViewController.videoID = channelsDataArray[selectedVideoIndex]["videoID"] as! String 
    } 
} 

尝试下载图像中不同的功能类似下面

func getImage(from urlString:String) -> UIImage? { 
    if let url = URL(string: urlString) { 
     do { 
      let imageContent = try Data(contentsOf: url) 

      //we have image dat 
      let image = UIImage(data: imageContent) 

      return image 
     } 
     catch { 
      print("Unable to get image data") 
     } 
    } 
    return nil 
} 

你可能想使用SDWebImage或其他尝试图像库，使平滑滚动可能在tableView。或做类似下面

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 

    var cell = tableView.dequeueReusableCell(withIdentifier: "idCellChannel", for: indexPath) 

    let channelTitleLabel = cell.viewWithTag(10) as! UILabel 
    let thumbnailImageView = cell.viewWithTag(12) as! UIImageView 
    let channelDetails = channelsDataArray[indexPath.row] 

    channelTitleLabel.text = channelDetails["title"] as? String 

    DispatchQueue.global(qos: .background).async { 
     if let imageURL = channelDetails["url"] as? String { 
      if let image = getImage(from: imageURL) { 
       thumbnailImageView.image = image 
      } 
     } 
    } 
    return cell 
}